I have been using Avidemux for a very long time. Until recently I have been editing audio on Audacity 1.3.12-beta and video on Avidemux 2.5.4 on my trusty Debian Squeeze. But now I've moved to Devuan (Debian fork) and am using Audacity 2.1.1 and Avidemux 2.5.6 GTK from Wheezy.
I spent hours rebuilding the audio track for a video @48000hz 32-bit float and exported it as a .wav as I've been doing for years. Then I opened Avidemux, went to audio settings, choose external .wav, found the file, saved and this nasty message popped up:
"Failed to open the file. Not a WAV file?"
The .wav files that I created using Audacity on Squeeze open just fine on Avidemux in Devuan.
Any thoughts how to fix this would be most welcome. I'll also be posting to the Audacity forum.